Syringe pumps

a technology of syringe and pump head, which is applied in the direction of piston pump, positive displacement liquid engine, instruments, etc., can solve the problem that the head actuator may trap the user's finger or other objects
US6966895B2Inactive Publication Date: 2005-11-22SMITHS GRP PLC
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Patent Information

Authority / Receiving Office
US · United States
Current Assignee / Owner
SMITHS GRP PLC
Publication Date
2005-11-22
Estimated Expiration
Not applicable · inactive patent

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Abstract

A syringe pump has a motor rotating a leadscrew to drive a plunger head actuator along it. The head actuator engages the plunger of a syringe and moves the plunger along the syringe barrel to dispense medication. An optical encoder mounted on the leadscrew is rotated by the motor to produce a pulse output. A control unit times the interval between the pulses and compares these timings with a stored value representative of a predetermined multiple of the minimum time. If the head actuator is obstructed, the speed of rotation of the motor is slowed and the time interval between pulses rises. When this exceeds the stored value, the control unit stops the drive to the head actuator and generates an alarm.
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Description

BACKGROUND OF THE INVENTION

[0001] This invention relates to syringe pumps.

[0002] Syringe pumps are used to supply medication to a patient from a pre-filled syringe via an infusion line. The syringe pump applies a force to the plunger of the syringe to drive medication into the infusion line at a controlled rate. The head of the plunger is engaged by a plunger head actuator that is movable along a leadscrew extending parallel to the axis of the syringe. The head actuator is movable from an extreme position at one end of the pump, where it allows the largest syringe to be loaded into the pump with its plunger fully extended, to an extreme position at the opposite end of the pump, where it fully depresses the plunger of the smallest syringe. There is a risk, when the head actuator is being moved back to its loading position, that the head actuator may trap the user's finger or other objects between the actuator and the pump housing.BRIEF SUMMARY OF THE INVENTION

[0003] It is an object of t...

Claims

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